function dp_twoPhaseMomentum_DP extends Modelica.Icons.Function; import PI = Modelica.Constants.pi; import MIN = Modelica.Constants.eps; import SMOOTH = Modelica.Fluid.Dissipation.Utilities.Functions.General.SmoothPower; input Modelica.Fluid.Dissipation.Utilities.Types.VoidFractionApproach voidFractionApproach = Modelica.Fluid.Dissipation.Utilities.Types.VoidFractionApproach.Homogeneous "Choice of void fraction approach" annotation( Dialog(group = "Choices")); input Boolean massFlowRateCorrection = false "Consider heterogeneous mass flow rate correction" annotation( Dialog(group = "Choices")); input SI.Area A_cross(min = Modelica.Constants.eps) = PI*0.1^2/4 "Cross sectional area" annotation( Dialog(group = "Geometry")); input SI.Length perimeter(min = Modelica.Constants.eps) = PI*0.1 "Perimeter" annotation( Dialog(group = "Geometry")); input SI.Density rho_g(min = Modelica.Constants.eps) "Density of gas" annotation( Dialog(group = "Fluid properties")); input SI.Density rho_l(min = Modelica.Constants.eps) "Density of liquid" annotation( Dialog(group = "Fluid properties")); input Real x_flow_end(min = 0, max = 1) = 0 "Mass flow rate quality at end of length" annotation( Dialog(group = "Fluid properties")); input Real x_flow_sta(min = 0, max = 1) = 0 "Mass flow rate quality at start of length" annotation( Dialog(group = "Fluid properties")); input SI.MassFlowRate m_flow "Mass flow rate" annotation( Dialog(group = "Input")); output SI.Pressure DP_mom "Momentum pressure loss"; end dp_twoPhaseMomentum_DP;